Sheave tensioning and adjusting device



Feb. 15, 1927.

H. A. CLARK.

SHEAVE TENSIONING AND ADJUSTING DEVICE Filed Jime 14. 1925 IN VEN TOR.

A TTORNEYS.

Patented Feb. 15, 1927.

v I UNITED SITES "HARRY A. CLARK, or WICHITA rans; TEXAS.

sHEAvE TENSIONING AND Amusrme DEVICE.

Application filed June 14, 192

The invention further aims among its objectsin so altering the position of thespudcling. shea e, el m n te. fr quen breakag of the sheave hanger, and consequently the repair ,e-gtpenses and time consumed in making such repairs.

With the foregoing and other objects and advantages in view, the invention has particular reference to its novel feature of construction and arrangement of parts, by whlch the said objects are attained, and which will be manifested in the course of the following detail description and made a subject of the annexed drawings, wherein: I

, Figure 1 is a fragmentary view of the usual portable type of drilling machines with portions cut away to illustrate the position of the invention thereon. V 1

Figure 2 is a side elevational view of the invention, and V Figure 3 is a top plan view thereof.

Although tensioning or cushioning means is provided for the present spudding line sheave, the position of the hanger upon which this means is mounted, must necessarily be in such position that when breakage occurs, it will be forcibly thrown by the releasing actionof the spring tensioning means directly toward the point of operations, and frequently falls Within the hole being drilled or cleaned. Should this be the case, considerable time and effort is spent fishing for the broken part to remove the same. I

The present invention proposes to obviate the foregoing disadvantage, by altering the position of the tensioning means in such a manner that should breakage occur the fractured member would be directed away from the hole.

With the above in view, attention is directed to Figure 1 which ,shows a fragmentary side view of a portable drilling machine having the usual spudding arms 1, which impart reciprocating motion to the drilling or spudding cable 2, in a manner such as will presently be disclosed.

se iesre 135,555. f M

ld otary; motion'is imparted tothe arm by; i ce n c ion to the ran rm 4, which latter. .of course is drivenby; asuit able engine mounted, upon the frame of; the machine. Theline'Q, is first-wound-about ar e d i ing rum fromaw c p in it extendsgover a sheave at, therearend'of the machine, (not shown) thence underthc sheave 6, forming part ;of ,the invention,

whereupon it continues. to the jtop of the mast. 7 A. and. when the latter, is, in; extended operativ po i i n t lin is .u edtcnctu'et too in th o .S rai upa rth shea fi i xce s v and a ta e .,pi-en 1 i1s1y r quent breakage of this member is consequently the result.

Now, the invention consists of the structure especially illustrated in Figures 2 and 3, composed of a lateral shaft 8, rotating in bearings 9 alilxed to opposing beams l. A double bell crank 10,'having its centralbear ing mounted upon the shaft 8 is provided, and intermediate the sides of the crank 10 the sheave 6 is rotatably mounted, while to its lower bearing a rod 11 is secured, and extends rearwardly through a'reinforced lateral beam 12, and is freely movable therein. A plate 13 is then applied to the protruding end of the rod and acts as a seat for a compression spring 14. A similar plate 15 is applied over the rod to engage the opposite 11 may be selectively engaged to alter the pov v sition of the sheave 6 with respect to the beams 1. r v

From the foregoing description, it'is apparent that excessive strain upon the sheave 6 resulting from irregular'and'forcible pulls from either end of'the line will be allevi- 'ated by the arrangement shown, as pivotal movement of the bell crank 10 to raise the sheave 6 in accordance with the pull upon v the cable will move the rod 11 to compress the and release the spring '14, the latter is so placed that it is impossible for the same to enter the hole to hinder or interrupt the drilling operation. 1

It should be understood herein that while the invention has beenspecifically described,

the same should not be restricted to-such limitation and that certain minor changes and modifications may be resorted to-as fall .within the meaning and scope of the follow ingclaims. r

.Iclaim:

1.' In a well drilling machine, a frame, a

pairof spaced spudding arms, a'transverse shaft on the arms adjacent the free ends 10 thereof, a bell crank mounted on the'shaft and having a sheave on one of its arms which extends above 'thespudding arms, a

* perforated transverse beam interposed bebetween, thefspuddingarms and-in substanti'ally'the plane thereof and connected at one" end to said other bell crank arm and at its opposite end projecting rearwardly through th'e'beam perforation, and a coil spring on '1 the projecting end of the rod abutting'the I 2 111 a well drilling machine, a frame, a

pair of spaced spudding arms, a transverse shaft on thevarms', adjacent the free ends thereof, a bell crank on the shaf't'having a sheave on one of'its arms which extends above the spudding arms, the other arm of the 1 bell crank extending downwardly between the spudding arms, a guide between the arms spaced rearwardly'of the shaft, a rod arranged in the space betweenthe spudding arms and connected at one end to said other bell crank arm, and having its'ot'her end extending through the guide, andspring means connected to the rod to tension the same, the said other arm of the bell crank, the rod and the spring-device being each housed by and between the spudding arms.

'In' testimony whereof I afiiX my signature.

HARRY A. V CLARK. 

